Exploring the Nerve Impulse Mechanism

What is a nerve impulse?

• A magnetic field

• An electrical current

• A mechanical force

• A chemical signal

What triggers voltage-gated channels to open and close?

• Temperature changes

• Electrical voltage

• Chemical signals

• Mechanical pressure

What maintains the charge difference in a resting neuron?

• Calcium channels

• Sodium-potassium pumps

• Chloride ions

• Passive diffusion

What is the net charge inside a neuron at rest?

• Positive

• Neutral

• Variable

• Negative

What initiates a nerve impulse?

• A stimulus disturbing the plasma membrane

• A mechanical force

• A change in temperature

• A chemical reaction

What happens when sodium channels open during a nerve impulse?

• Calcium ions enter the cell

• Sodium ions enter the cell

• Potassium ions enter the cell

• Sodium ions leave the cell

What is the term for the moving depolarization along the neuron membrane?

• Resting potential

• Action potential

• Hyperpolarization

• Repolarization

What happens to the membrane behind the action potential?

• It remains depolarized

• It becomes hyperpolarized

• It repolarizes

• It becomes neutral

Which channels open to repolarize the membrane?

• Sodium channels

• Calcium channels

• Chloride channels

• Potassium channels

What restores the resting membrane potential after an action potential?

• Chloride channels

• Sodium-potassium pumps

• Magnesium pumps

• Calcium pumps